On this day in Iowa weather history, June 18, 2014
1974: A thunderstorm tracked from around Fort Dodge, near Ames, to Ankeny and northeast Des Moines and then to around Oskaloosa. More than two dozen funnel clouds were reported and at least half of these touched down as tornadoes, one of which caused F4 damage between Ankeny and Runnels killing 2 people and injuring 50. Baseball sized hail also caused extensive damage around Ames.
Source – National Weather Service Des Moines